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In WinRT, do I need to call Close() on IAsyncOperation<T> ^ objects? Either the the operation initiating code, or in the completion handler? If not, why is it there?
From your syntax, you’re using C++/CX.
For C++/CX, IAsyncOperation::Close is automatically called in the destructor, so you do not need to explicitly call it.
For JS, you must explicitly call .close().
For C#, it’s projected as IDisposable, so a using() statement is appropriate.